/*
  将下面异步代码使用 Promise 的方法改进
  尽量用看上去像同步代码的方式
  setTimeout(function () {
    var a = 'hello'
    setTimeout(function () {
      var b = 'lagou'
      setTimeout(function () {
        var c = 'I ♥ U'
        console.log(a + b +c)
      }, 10)
    }, 10)
  }, 10)
*/


const promise = new Promise((resolve, reject) => {
  resolve('hello');
})

promise.then(rs => {
  const b = 'lagou'
  return rs + b;
}).then(rs => {
  const c = 'I ♥ U'
  return rs + c;
}).then(rs => {
  console.log(rs + c);
})

